行星及月球英文版ppt課件(已修改)
2025-01-28 06:34 本頁面
【正文】 Plas and Moons Overview This online lessons consists of the chapters ?The Solar System ?The Plas ?Moons ?Plas of other stars ?More information: Links The Solar System What is the Solar System? In the Universe, the Solar System is our homeland, and the Earth is our hometown. The Solar System The Solar System consists of ? the sun in its centre ? nine plas, circling around the sun ? moons ? asteroids ? and ets. The Solar System How did the Solar System evolve? ? Scientists are quite sure, that in the beginning of our Solar System there was a huge disc of dirt, rocks, gas, ice etc. ? In the middle of this disc, the Sun formed itself and began to glow. ? In some distances from the centre, the plas emerged from these rings of dirt, rocks and gas. The Solar System How large is our Solar System? ?The orbit on which Pluto (the farthest pla) circles the sun, has an average diameter of km (Pluto‘s orbit is rather noncircular). ?The sun itself, the largest object in our Solar System has a diameter of km. The Solar System How can I imagine these sizes and distances? ? Imagine the Solar
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